treevalue.utils.singleton
============================

SingletonMeta
-------------------

.. autoclass:: treevalue.utils.singleton.SingletonMeta
    :members: __call__


ValueBasedSingletonMeta
----------------------------

.. autoclass:: treevalue.utils.singleton.ValueBasedSingletonMeta
    :members: __call__


SingletonMark
------------------

.. autoclass:: treevalue.utils.singleton.SingletonMark
    :members: __init__, mark, __hash__, __eq__, __repr__